Method of producing coated cores



y 7 J. L. RAY

METHOD OF PRODUCING COATED CORES Fi1 ed Feb. 14. 1925 ay 31, rear. A

Patented METHOD OF PRODUCING COATED CORES.

Application filed February This invention relates to electric cable and the process of making the sam The principal deterrent to the extension of central station power service into rural a communities is recognized as being the disproportionately high initial cost for line ;ext'ension. The usual type of construction for reaching rural roads is the pole-line which, of course, is relatively very expenm sive. I

' It is the object of this invention to providea oable'and a process of making the same which shall be both cheap and eflicient.-

In accordance with this invention a mix- 'ture of paper pulp and heavy oil, the paper pulp being preferably astifi' compound of chemically and minerally pure dehydrated sulphite pulp, and the oil being preferably petrolatum. The covering may be applied by extruding the same upon the wire by a tubing machine and as it emerges therefrom it is sprayed with a quick drying cohesive, f

such as ether-shellac, to form a'film completelysurrounding the wire and coating to hold the pulp in position as it is passing tothe lead press or equivalent sheathing inachine. Preferably a blast of cold, dry air is applied tothe coating after the shellac is applied. A greatadvanta e of the present covering resides in the act that it is capable of being applied to the conductorthrough a tubing machine such as is used by most manufacturers of rubber covered wire and cable, a ve much cheaper way I6 than to apply paper in the form of tape, which is slow and expensive and which must be followed by a still slower process. of dehydration and impregnation in tanks. The use of petrolatum which does not harden l0 leaves'the pulp insulation sufliciently soft so that the covering remains in a plastic condition and the insulation is not impaired when the conductor is subjected to the ordinary bends-resulting from normal work- 5 in as in the case of paper tape covering.

. he method and product will be more clearly understood from the following description taken in connection with the attached drawing which shows schematically o *the method of applying the coating.

-In the drawing. 1 represents a container 14, 1925. Serial No. 9,160.

preferably of metal andhaving a nozzle2 by piston 3 to force the mixture through the nnw-unnsnx, Assrenon T0 wnsrnnn nnncrnrc I or nnw YORK, n. 2., a conronarron on NEW xonx.

nozzle 2. A removable plug 4 is inserted in the container diametrically opposite the nozzle and through a longitudinal hole in the plug the wire 5 is slowly drawn. The

axes of plug 4 and nozzle 2 should coincide as nearly as possible so that the wire 5 may pass through the container in a straight line and be held at the center of the nozzle.

As the wire passes out of the nozzle 2 some of the pulp and oil mixture which is under the pressure exerted by piston 3 will be forced out with it and will tend to adhere thereto. A series of nozzles -7 is arranged to-spray the pulp coating as it leaves nozzle 2 with a quick drying cohesive substance such as ether-shellac, alcohol-shellac, etc. A second series of nozzles 8 is arranged to direct a blast of cold dry air on. the coating to dry the soft pulpous material in it reaches the lead press (not a lead sheath is applied in the osition until own) where well known manner. In some cases it may be desirable to use some form. of silicate carried in alcohol or ether through prevent the hotleadfrom distorting the insulating tube where Other means may be employed for feedmg the mixture to the container and for applying pressure to the mixture than that shown. 'Applicants drawing merely shows a very simple method and is not to be limited to the specific means above. What is claimed is: p v 1.. A process of coating cores which con- '75 it and thereby hold v the atomizer jets to the hot lead strikes it.

sists in extruding a mix'tiire of pulp and heavy-oil on said core, coating the same with a film of cohesive material, and enclosing the whole in a sheath.

' 2. A process of coating cores which consists in passing said core through a mixture of paper pulpand a heavy oil which is under pressure, coating the adhesive mix vture with a film of cohesive material, and enclosing the whole in wsheath.

3. A process of coating cores which conof cold dry aid and then enclosing the whole sists in extruding, under pressure, a mixture in a sheath. I of chemically and minerally pure dehydrat- In witness whereof, I hereunto subscribe ed sulphite pulp and a heavy oil, such as my name this 11th day of February A. 5 petrolatum, coating the same with a film 1925.

of a quick drying cohesive material, such as ether or alcohol shellac, applying a blast JOSEPH L. RAY. 

